Maybe use TDMA - multiple time slots. -- Cinaed
On 08/21/2017 05:52 AM, mohammad nejati wrote: > Dear Marcus > > There are one 5 Mhz modulated bandwidth centered and transmited on > 1ghz . in the cable i add 1 Mhz modulated bandwidth centered in the > same occupied bandwidth for example 1ghz or 1.001 ghz or .. > i want do some thing like this in satellites link : > http://www.newtec.eu/frontend/files/leaflet/bwc0900-bandwidth-canceller.pdf > > Thank you . > > On Sun, Aug 20, 2017 at 8:41 PM, mohammad nejati <tufa...@gmail.com> wrote: >> Hi , >> It is difficult to explain what i need but i want to try it . >> >> I have a single modulated carrier with 5 Mhz bandwidth i send it throw >> cable and receive delayed version of that with a good SNR like 45dB . >> >> I store i/q sample in last stage of transmitter , >> In cable i add one 1 Mhz carrier with lower power into exactly 5 mhz >> equipped bandwidth of carrier (1Mhz carrier is hidden in 5 Mhz carrier >> due to lower signal power) . >> what i want to do is in receiver subtract transited signal from >> received signal in a proper delay and phase and recover 1 Mhz carrier >> . >> >> I use LMS algorithm for adaption and subtraction and that work only >> when received i/q sample have exactly same center frequency with >> stored transmitted i/q sample which in reality with SDR board and zero >> if architecture it is almost impossible . i don't want find center >> frequency of received carrier with method like costas loop , because >> modulated signal may have difference modulation like 64 QAM , 16 QAM , >> 32APSK , BPSK ... i want find and lock received center frequency and >> phase with help of that i stored a correct version of that before >> transmit . >> >> i attached an image of subtracted signal and recovered smaller carrier >> (which is in an ideal condition without frequency drift). >> >> Thank you , > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
